package com.cn.hsg.tools;

import java.util.HashMap;

public class HTMLDecoder {
 public static final HashMap<String, Character> charTable;   
   
   public static String decode(String s) {   
     String t;   
     Character ch;   
     int tmpPos, i;   
   
     int maxPos = s.length();   
     StringBuffer sb = new StringBuffer(maxPos);   
     int curPos = 0;   
     while (curPos < maxPos) {   
       char c = s.charAt(curPos++);   
       if (c == '&') {   
         tmpPos = curPos;   
         if (tmpPos < maxPos) {   
           char d = s.charAt(tmpPos++);   
           if (d == '#') {   
             if (tmpPos < maxPos) {   
               d = s.charAt(tmpPos++);   
               if ((d == 'x') || (d == 'X')) {   
                 if (tmpPos < maxPos) {   
                   d = s.charAt(tmpPos++);   
                   if (isHexDigit(d)) {   
                     while (tmpPos < maxPos) {   
                       d = s.charAt(tmpPos++);   
                       if (!isHexDigit(d)) {   
                         if (d == ';') {   
                           t = s.substring(curPos + 2, tmpPos - 1);   
                           try {   
                             i = Integer.parseInt(t, 16);   
                             if ((i >= 0) && (i < 65536)) {   
                               c = (char) i;   
                               curPos = tmpPos;   
                             }   
                           } catch (NumberFormatException e) {   
                           }   
                         }   
                         break;   
                       }   
                     }   
                   }   
                 }   
               } else if (isDigit(d)) {   
                 while (tmpPos < maxPos) {   
                   d = s.charAt(tmpPos++);   
                   if (!isDigit(d)) {   
                     if (d == ';') {   
                       t = s.substring(curPos + 1, tmpPos - 1);   
                       try {   
                         i = Integer.parseInt(t);   
                         if ((i >= 0) && (i < 65536)) {   
                           c = (char) i;   
                           curPos = tmpPos;   
                         }   
                       } catch (NumberFormatException e) {   
                       }   
                     }   
                     break;   
                   }   
                 }   
               }   
             }   
           } else if (isLetter(d)) {   
             while (tmpPos < maxPos) {   
               d = s.charAt(tmpPos++);   
               if (!isLetterOrDigit(d)) {   
                 if (d == ';') {   
                   t = s.substring(curPos, tmpPos - 1);   
                   ch = (Character) charTable.get(t);   
                   if (ch != null) {   
                     c = ch.charValue();   
                     curPos = tmpPos;   
                   }   
                 }   
                 break;   
               }   
             }   
           }   
         }   
       }   
       sb.append(c);   
     }   
     return sb.toString();   
   }   
   
   private static boolean isLetterOrDigit(char c) {   
     return isLetter(c) || isDigit(c);   
   }   
   
   private static boolean isHexDigit(char c) {   
     return isHexLetter(c) || isDigit(c);   
   }   
   
   private static boolean isLetter(char c) {   
     return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));   
   }   
   
   private static boolean isHexLetter(char c) {   
     return ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F'));   
   }   
   
   private static boolean isDigit(char c) {   
     return (c >= '0') && (c <= '9');   
   }   
   
   public static String compact(String s) {   
     int maxPos = s.length();   
     StringBuffer sb = new StringBuffer(maxPos);   
     int curPos = 0;   
     while (curPos < maxPos) {   
       char c = s.charAt(curPos++);   
       if (isWhitespace(c)) {   
         while ((curPos < maxPos) && isWhitespace(s.charAt(curPos))) {   
           curPos++;   
         }   
         c = '\u0020';   
       }   
       sb.append(c);   
     }   
     return sb.toString();   
   }   
   
   // HTML is very particular about what constitutes white space.   
   public static boolean isWhitespace(char ch) {   
     return (ch == '\u0020') || (ch == '\r') || (ch == '\n') || (ch == '\u0009') || (ch == '\u000c') || (ch == '\u200b');   
   }   
   
   static {   
     charTable = new HashMap<String, Character>();   
     charTable.put("quot", new Character((char) 34));   
     charTable.put("amp", new Character((char) 38));   
     charTable.put("apos", new Character((char) 39));   
     charTable.put("lt", new Character((char) 60));   
     charTable.put("gt", new Character((char) 62));   
     charTable.put("nbsp", new Character((char) 160));   
     charTable.put("iexcl", new Character((char) 161));   
     charTable.put("cent", new Character((char) 162));   
     charTable.put("pound", new Character((char) 163));   
     charTable.put("curren", new Character((char) 164));   
     charTable.put("yen", new Character((char) 165));   
     charTable.put("brvbar", new Character((char) 166));   
     charTable.put("sect", new Character((char) 167));   
     charTable.put("uml", new Character((char) 168));   
     charTable.put("copy", new Character((char) 169));   
     charTable.put("ordf", new Character((char) 170));   
     charTable.put("laquo", new Character((char) 171));   
     charTable.put("not", new Character((char) 172));   
     charTable.put("shy", new Character((char) 173));   
     charTable.put("reg", new Character((char) 174));   
     charTable.put("macr", new Character((char) 175));   
     charTable.put("deg", new Character((char) 176));   
     charTable.put("plusmn", new Character((char) 177));   
     charTable.put("sup2", new Character((char) 178));   
     charTable.put("sup3", new Character((char) 179));   
     charTable.put("acute", new Character((char) 180));   
     charTable.put("micro", new Character((char) 181));   
     charTable.put("para", new Character((char) 182));   
     charTable.put("middot", new Character((char) 183));   
     charTable.put("cedil", new Character((char) 184));   
     charTable.put("sup1", new Character((char) 185));   
     charTable.put("ordm", new Character((char) 186));   
     charTable.put("raquo", new Character((char) 187));   
     charTable.put("frac14", new Character((char) 188));   
     charTable.put("frac12", new Character((char) 189));   
     charTable.put("frac34", new Character((char) 190));   
     charTable.put("iquest", new Character((char) 191));   
     charTable.put("Agrave", new Character((char) 192));   
     charTable.put("Aacute", new Character((char) 193));   
     charTable.put("Acirc", new Character((char) 194));   
     charTable.put("Atilde", new Character((char) 195));   
     charTable.put("Auml", new Character((char) 196));   
     charTable.put("Aring", new Character((char) 197));   
     charTable.put("AElig", new Character((char) 198));   
     charTable.put("Ccedil", new Character((char) 199));   
     charTable.put("Egrave", new Character((char) 200));   
     charTable.put("Eacute", new Character((char) 201));   
     charTable.put("Ecirc", new Character((char) 202));   
     charTable.put("Euml", new Character((char) 203));   
     charTable.put("Igrave", new Character((char) 204));   
     charTable.put("Iacute", new Character((char) 205));   
     charTable.put("Icirc", new Character((char) 206));   
     charTable.put("Iuml", new Character((char) 207));   
     charTable.put("ETH", new Character((char) 208));   
     charTable.put("Ntilde", new Character((char) 209));   
     charTable.put("Ograve", new Character((char) 210));   
     charTable.put("Oacute", new Character((char) 211));   
     charTable.put("Ocirc", new Character((char) 212));   
     charTable.put("Otilde", new Character((char) 213));   
     charTable.put("Ouml", new Character((char) 214));   
     charTable.put("times", new Character((char) 215));   
     charTable.put("Oslash", new Character((char) 216));   
     charTable.put("Ugrave", new Character((char) 217));   
     charTable.put("Uacute", new Character((char) 218));   
     charTable.put("Ucirc", new Character((char) 219));   
     charTable.put("Uuml", new Character((char) 220));   
     charTable.put("Yacute", new Character((char) 221));   
     charTable.put("THORN", new Character((char) 222));   
     charTable.put("szlig", new Character((char) 223));   
     charTable.put("agrave", new Character((char) 224));   
     charTable.put("aacute", new Character((char) 225));   
     charTable.put("acirc", new Character((char) 226));   
     charTable.put("atilde", new Character((char) 227));   
     charTable.put("auml", new Character((char) 228));   
     charTable.put("aring", new Character((char) 229));   
     charTable.put("aelig", new Character((char) 230));   
     charTable.put("ccedil", new Character((char) 231));   
     charTable.put("egrave", new Character((char) 232));   
     charTable.put("eacute", new Character((char) 233));   
     charTable.put("ecirc", new Character((char) 234));   
     charTable.put("euml", new Character((char) 235));   
     charTable.put("igrave", new Character((char) 236));   
     charTable.put("iacute", new Character((char) 237));   
     charTable.put("icirc", new Character((char) 238));   
     charTable.put("iuml", new Character((char) 239));   
     charTable.put("eth", new Character((char) 240));   
     charTable.put("ntilde", new Character((char) 241));   
     charTable.put("ograve", new Character((char) 242));   
     charTable.put("oacute", new Character((char) 243));   
     charTable.put("ocirc", new Character((char) 244));   
     charTable.put("otilde", new Character((char) 245));   
     charTable.put("ouml", new Character((char) 246));   
     charTable.put("divide", new Character((char) 247));   
     charTable.put("oslash", new Character((char) 248));   
     charTable.put("ugrave", new Character((char) 249));   
     charTable.put("uacute", new Character((char) 250));   
     charTable.put("ucirc", new Character((char) 251));   
     charTable.put("uuml", new Character((char) 252));   
     charTable.put("yacute", new Character((char) 253));   
     charTable.put("thorn", new Character((char) 254));   
     charTable.put("yuml", new Character((char) 255));   
     charTable.put("OElig", new Character((char) 338));   
     charTable.put("oelig", new Character((char) 339));   
     charTable.put("Scaron", new Character((char) 352));   
     charTable.put("scaron", new Character((char) 353));   
     charTable.put("fnof", new Character((char) 402));   
     charTable.put("circ", new Character((char) 710));   
     charTable.put("tilde", new Character((char) 732));   
     charTable.put("Alpha", new Character((char) 913));   
     charTable.put("Beta", new Character((char) 914));   
     charTable.put("Gamma", new Character((char) 915));   
     charTable.put("Delta", new Character((char) 916));   
     charTable.put("Epsilon", new Character((char) 917));   
     charTable.put("Zeta", new Character((char) 918));   
     charTable.put("Eta", new Character((char) 919));   
     charTable.put("Theta", new Character((char) 920));   
     charTable.put("Iota", new Character((char) 921));   
     charTable.put("Kappa", new Character((char) 922));   
     charTable.put("Lambda", new Character((char) 923));   
     charTable.put("Mu", new Character((char) 924));   
     charTable.put("Nu", new Character((char) 925));   
     charTable.put("Xi", new Character((char) 926));   
     charTable.put("Omicron", new Character((char) 927));   
     charTable.put("Pi", new Character((char) 928));   
     charTable.put("Rho", new Character((char) 929));   
     charTable.put("Sigma", new Character((char) 931));   
     charTable.put("Tau", new Character((char) 932));   
     charTable.put("Upsilon", new Character((char) 933));   
     charTable.put("Phi", new Character((char) 934));   
     charTable.put("Chi", new Character((char) 935));   
     charTable.put("Psi", new Character((char) 936));   
     charTable.put("Omega", new Character((char) 937));   
     charTable.put("alpha", new Character((char) 945));   
     charTable.put("beta", new Character((char) 946));   
     charTable.put("gamma", new Character((char) 947));   
     charTable.put("delta", new Character((char) 948));   
     charTable.put("epsilon", new Character((char) 949));   
     charTable.put("zeta", new Character((char) 950));   
     charTable.put("eta", new Character((char) 951));   
     charTable.put("theta", new Character((char) 952));   
     charTable.put("iota", new Character((char) 953));   
     charTable.put("kappa", new Character((char) 954));   
     charTable.put("lambda", new Character((char) 955));   
     charTable.put("mu", new Character((char) 956));   
     charTable.put("nu", new Character((char) 957));   
     charTable.put("xi", new Character((char) 958));   
     charTable.put("omicron", new Character((char) 959));   
     charTable.put("pi", new Character((char) 960));   
     charTable.put("rho", new Character((char) 961));   
     charTable.put("sigmaf", new Character((char) 962));   
     charTable.put("sigma", new Character((char) 963));   
     charTable.put("tau", new Character((char) 964));   
     charTable.put("upsilon", new Character((char) 965));   
     charTable.put("phi", new Character((char) 966));   
     charTable.put("chi", new Character((char) 967));   
     charTable.put("psi", new Character((char) 968));   
     charTable.put("omega", new Character((char) 969));   
     charTable.put("thetasym", new Character((char) 977));   
     charTable.put("upsih", new Character((char) 978));   
     charTable.put("piv", new Character((char) 982));   
     charTable.put("ensp", new Character((char) 8194));   
     charTable.put("emsp", new Character((char) 8195));   
     charTable.put("thinsp", new Character((char) 8201));   
     charTable.put("zwnj", new Character((char) 8204));   
     charTable.put("zwj", new Character((char) 8205));   
     charTable.put("lrm", new Character((char) 8206));   
     charTable.put("rlm", new Character((char) 8207));   
     charTable.put("ndash", new Character((char) 8211));   
     charTable.put("mdash", new Character((char) 8212));   
     charTable.put("lsquo", new Character((char) 8216));   
     charTable.put("rsquo", new Character((char) 8217));   
     charTable.put("sbquo", new Character((char) 8218));   
     charTable.put("ldquo", new Character((char) 8220));   
     charTable.put("rdquo", new Character((char) 8221));   
     charTable.put("bdquo", new Character((char) 8222));   
     charTable.put("dagger", new Character((char) 8224));   
     charTable.put("Dagger", new Character((char) 8225));   
     charTable.put("bull", new Character((char) 8226));   
     charTable.put("hellip", new Character((char) 8230));   
     charTable.put("permil", new Character((char) 8240));   
     charTable.put("prime", new Character((char) 8242));   
     charTable.put("Prime", new Character((char) 8243));   
     charTable.put("lsaquo", new Character((char) 8249));   
     charTable.put("rsaquo", new Character((char) 8250));   
     charTable.put("oline", new Character((char) 8254));   
     charTable.put("frasl", new Character((char) 8260));   
     charTable.put("euro", new Character((char) 8364));   
     charTable.put("image", new Character((char) 8465));   
     charTable.put("weierp", new Character((char) 8472));   
     charTable.put("real", new Character((char) 8476));   
     charTable.put("trade", new Character((char) 8482));   
     charTable.put("alefsym", new Character((char) 8501));   
     charTable.put("larr", new Character((char) 8592));   
     charTable.put("uarr", new Character((char) 8593));   
     charTable.put("rarr", new Character((char) 8594));   
     charTable.put("darr", new Character((char) 8595));   
     charTable.put("harr", new Character((char) 8596));   
     charTable.put("crarr", new Character((char) 8629));   
     charTable.put("lArr", new Character((char) 8656));   
     charTable.put("uArr", new Character((char) 8657));   
     charTable.put("rArr", new Character((char) 8658));   
     charTable.put("dArr", new Character((char) 8659));   
     charTable.put("hArr", new Character((char) 8660));   
     charTable.put("forall", new Character((char) 8704));   
     charTable.put("part", new Character((char) 8706));   
     charTable.put("exist", new Character((char) 8707));   
     charTable.put("empty", new Character((char) 8709));   
     charTable.put("nabla", new Character((char) 8711));   
     charTable.put("isin", new Character((char) 8712));   
     charTable.put("notin", new Character((char) 8713));   
     charTable.put("ni", new Character((char) 8715));   
     charTable.put("prod", new Character((char) 8719));   
     charTable.put("sum", new Character((char) 8721));   
     charTable.put("minus", new Character((char) 8722));   
     charTable.put("lowast", new Character((char) 8727));   
     charTable.put("radic", new Character((char) 8730));   
     charTable.put("prop", new Character((char) 8733));   
     charTable.put("infin", new Character((char) 8734));   
     charTable.put("ang", new Character((char) 8736));   
     charTable.put("and", new Character((char) 8743));   
     charTable.put("or", new Character((char) 8744));   
     charTable.put("cap", new Character((char) 8745));   
     charTable.put("cup", new Character((char) 8746));   
     charTable.put("int", new Character((char) 8747));   
     charTable.put("there4", new Character((char) 8756));   
     charTable.put("sim", new Character((char) 8764));   
     charTable.put("cong", new Character((char) 8773));   
     charTable.put("asymp", new Character((char) 8776));   
     charTable.put("ne", new Character((char) 8800));   
     charTable.put("equiv", new Character((char) 8801));   
     charTable.put("le", new Character((char) 8804));   
     charTable.put("ge", new Character((char) 8805));   
     charTable.put("sub", new Character((char) 8834));   
     charTable.put("sup", new Character((char) 8835));   
     charTable.put("nsub", new Character((char) 8836));   
     charTable.put("sube", new Character((char) 8838));   
     charTable.put("supe", new Character((char) 8839));   
     charTable.put("oplus", new Character((char) 8853));   
     charTable.put("otimes", new Character((char) 8855));   
     charTable.put("perp", new Character((char) 8869));   
     charTable.put("sdot", new Character((char) 8901));   
     charTable.put("lceil", new Character((char) 8968));   
     charTable.put("rceil", new Character((char) 8969));   
     charTable.put("lfloor", new Character((char) 8970));   
     charTable.put("rfloor", new Character((char) 8971));   
     charTable.put("lang", new Character((char) 9001));   
     charTable.put("rang", new Character((char) 9002));   
     charTable.put("loz", new Character((char) 9674));   
     charTable.put("spades", new Character((char) 9824));   
     charTable.put("clubs", new Character((char) 9827));   
     charTable.put("hearts", new Character((char) 9829));   
     charTable.put("diams", new Character((char) 9830));   
   }
}